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Job No. 4780201 • • 5 <br /> Soil samples will be collected using a California modified split-spoon sampler <br /> equipped with two-inch diameter brass sampling tubes. All soil sampling <br /> ' equipment will be cleaned with a non-phosphate detergent solution and rinsed <br /> with clean water between each sampling drive to prevent the potential transfer <br /> ' of contamination between sample intervals. <br /> 3.2 Well Construction Protocol <br /> The well will be constructed with factory threaded, two-inch diameter PVC <br /> ' casing. Blank casing will be extended from the ground surface to a point <br /> approximately two-to five-feet above static water level, and factory slotted- <br /> casing will be extended from that point to the total depth of the well (an <br /> estimated interval of approximately ten-to-fifteen feet). The screen slot size for <br /> ' the perforated interval will be 0.02 inches. The annular space of the borehole <br /> surrounding the slotted interval will be filled with a #3 sand as a filter pack to a <br /> point of approximately two feet above the top of the slotted interval. A 1-to 2- <br /> foot seal will be installed in the annulus immediately above the filter pack using <br /> ' bentonite pellets. A Class-A, neat cement grout will then be installed in the <br /> annulus that extends from the bentonite plug to the ground surface. <br /> A water-tight, locking plug will be placed on top of the well casing, and a <br /> ' locking Christy box will be installed at the ground surface to prevent <br /> unauthorized entry or the infiltration of surface contamination. <br /> t <br /> EsC, Inc. April 4, 1997 <br />